Leverage Cargo's workspace inheritance feature (#4905)

* Leverage Cargo's workspace inheritance feature

This commit is an attempt to reduce the complexity of the Cargo
manifests in this repository with Cargo's workspace-inheritance feature
becoming stable in Rust 1.64.0. This feature allows specifying fields in
the root workspace `Cargo.toml` which are then reused throughout the
workspace. For example this PR shares definitions such as:

* All of the Wasmtime-family of crates now use `version.workspace =
  true` to have a single location which defines the version number.
* All crates use `edition.workspace = true` to have one default edition
  for the entire workspace.
* Common dependencies are listed in `[workspace.dependencies]` to avoid
  typing the same version number in a lot of different places (e.g. the
  `wasmparser = "0.89.0"` is now in just one spot.

Currently the workspace-inheritance feature doesn't allow having two
different versions to inherit, so all of the Cranelift-family of crates
still manually specify their version. The inter-crate dependencies,
however, are shared amongst the root workspace.

This feature can be seen as a method of "preprocessing" of sorts for
Cargo manifests. This will help us develop Wasmtime but shouldn't have
any actual impact on the published artifacts -- everything's dependency
lists are still the same.

* Fix wasi-crypto tests

crates/wasi-nn/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "wasmtime-wasi-nn"
-version = "2.0.0"
-authors = ["The Wasmtime Project Developers"]
+version.workspace = true
+authors.workspace = true
 description = "Wasmtime implementation of the wasi-nn API"
 documentation = "https://docs.rs/wasmtime-wasi-nn"
 license = "Apache-2.0 WITH LLVM-exception"
@@ -9,12 +9,12 @@ categories = ["wasm", "computer-vision"]
 keywords = ["webassembly", "wasm", "neural-network"]
 repository = "https://github.com/bytecodealliance/wasmtime"
 readme = "README.md"
-edition = "2021"
+edition.workspace = true
 
 [dependencies]
 # These dependencies are necessary for the witx-generation macros to work:
-anyhow = "1.0"
-wiggle = { path = "../wiggle", version = "=2.0.0" }
+anyhow = { workspace = true }
+wiggle = { workspace = true }
 
 # These dependencies are necessary for the wasi-nn implementation:
 openvino = { version = "0.4.1", features = ["runtime-linking"] }